Red-Legged Partridges, if they do stray into mist nets, would be more likely to leave a hole than to stay in. This one, after having a photo taken, was released and left to go on its merry way.
A much more regularly caught bird, the Long Tailed Tit, threw up another surprise as you can see:
This bird still retained some pigmentation, but was remarkably pale all over. It was caught along with a regularly coloured bird (presumably a pair) and had a better weight, though the colour of the bird does not effect it's ability to feed. It may provide it with more camouflage during the snowy times though!